How far should a 13 year old go?

I'm 13 and pretty unpopular in my year but this evening a boy from my year who is very popular asked me how far I would go with him sexually I told him I didn't know and he said he would go quite far with me. He asked me if I sent nudes before and I said I didn't and I feel like he is judging me as a lot of girls In my year have. What shall I do because he keeps being really nice to me but I don't know if it's an act to get photos of me. What shall I do?
Update
Thankyou guys so much for your advice I got another snapchat from him today and he was all over this other girl and asking me if she sent nudes he's just a fuckboy 🙄🙄 Thankyou so much love you all xxx

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